Baffle-plate for water-tube boilers.



J. B. ARCHER. BAPI'LE PLATE FOR WATER TUBE BOILERS.

APPLICATION FILED FEB. 5, 1908.

Patented Dec. 15, 1908 UNITED srn'ras PATENT orrion.

BAFFLE-PLATE FOR WATER-TUBE BOILERS.

Specification of Letters Patent.

Application filed February 5, 1908. Serial No. 414,431.

Patented Dec. 15, 1908.

.To all whom it My'concem:

I 3e it known that I, JOHN B. A CHER, a c tizen of the United States, residing .at'Kensington, in the county of Montgomery and State of Maryland, have invented certain new and useful Improvements in Baffle- Plates for ater-Tube Boilers, of which the following is a s ecification.

In steam boi ers 'of the type in which the heating surface consists of a number of parallel water tubes, it is customary to interpose one or more baffles between certain tubes or layers of tubes to cause the outgoing'gase's to take a tortuous course through t e tubes, thereby delaying their esca e to the stack until their temperature has been reduced to the desired minimum.

The ordinary baffle consists of a number of fire-clay tiles, resting upon or fitted between the water tubes. I have found that these baffles may be converted into a means for effecting complete combustion of the fuel gases and preventing the deposit of soot upon the water tubes, by providing the tiles with projections which extend outwardv into the path of the outgoing gases. These projections, which are preferably frusto-pyramidal in sha e, soon become heated to incandescence y the outgoing products and not only act mechanically to thoroughly mix any unburned fuel gases with the air, thereby completing their combustion, but also facilitate the combustion and prevent the deposit of soot upon the water tubes by equalizing the tern erature of all portions of the products of com ustion.

These improved baflle plates can be emlo ed to advantage with any water tube boi er. For the sake of illustration, they are shown applied to a wellknown ty e of boiler com risinga cylindrical steam rum, from the, ront and rearends of which depend -wa ter legs or headers which are connected by the water tubes.

Referring to the accompanying drawings; Figure 1 is a longitudinal vertical section through the boiler and its furnace, showing pertain elevation. .Fig. 2 is a erspective view of one of the improved ti es, viewed from beneath; and Fig. 3 is a perspective view of a portion of two water tubes with tiles between them, viewed from above.

The boiler showncom rises a cylindrical stem-drum 1, from the ont and rear portions of which dependiwater legs orheaders 2, 3, between which extend the water tubes 4. A horizontal baflle 5, extending from baflie 6 extends forward from the rear water leg 3and closes the spaces between the upper Water legs except at the front. The products of combustion rising from the 'fire box im- Binge against the lower faces of the tiles of the affle 5, pass rearwardly over the bridge wall, thence rise, i'm inge against the lower face of the tiles of the aflle 6, move forward, escape from the water tubes at the front and pass to the stack. Each baffle consists of a numb'er of rows of tiles 7, the tiles of each row abutting at their ends and. closing the space between adjacent water tu bes.

The construction and arrangement of the tiles is clearly shown in Figs. 2 and 3. Each tile consists ofja body portion 8 the lateral edges ofwhich have curved recesses to fit between the u per portions of the water tubes. tile depend projections 9, here shown as three in number and each having the sha e of a frustum of a pyramid with a square ase. These projections, which may be of any number and shape, are preferably integral with the tile. The tile may consist of any refractory material but is preferably composed of a mixture of fire clay, 75 parts, and some refractory form of carbon such as plumbago or retort carbon, 25 parts.

It will be seen that each baflle presents a large number of rojections which de end into the path of t 1e outgoing gases. hese projections, being comparatively narrow, are soon heated to incandescence and thoroughly mix the fuel gases and air, preventing any portion of them from being chilled by thevcold water tubes to a point where soot is deposited. The products of combustion which finally escape to the stack pass off as a light gray vapor containing substantially no smoke, soot or unburned fuel gases;

I claim 1. A tile consisting of a slab of refractory material adapted to rest upon parallel tubes of a boiler and provided with a plurality of spaced depending projections. -2. A tile consistmg of a; slab of refractory From tie lower face of the material adapted to rest upon-"parallelktubes of a boiler and'provid'ed with a plurality of projections.

' 4. A tile consisting of a slab or refractory material having'recess'ed edges adapted to*' rest upon parallel tubes of a boiler and provided with a plurality ofspaced depending projections.

4 5. A tile consistingof a slab of refractory material having recessed edges adapted to rest upon parallel tubes of a boiler and royidd with a' plurality of spaced depen ing pyram idal PIOjGCtiODS.

6. A tile consistmg of a slab of mixed fire- 4 ,1

clay and carbon, having recessed ed es adapted to rest upon paralleltubes 0 a boiler and provided with a plurality of spaced de ending yramoidal rojections.

' lntesti inony w ereof, I aifix myv-signa ture n; presence of two Witnesses.

JAMES B. COOK, GRETCHEN H. 0001:. 

